A problem with the readln function

When you are working with 'readln'/'read' the contents of the file that you are reading must match exactly what you are trying to read from your Mosel model: uncommenting the lines

!readln("NAME", fileName)

!readln("COMMENT")

in your latest code example above will match the format of your input file and input values are read in correctly.

You may want to add a test after the individual read statements, such as:

procedure testread(num: integer)
  numread:=getparam("nbread")
  if numread<>num then
    writeln("Read error (expected:", num, " items read:", numread, ")")
    exit(1)
  end-if
end-procedure
 
!...
readln("FAMILIES", Nf)
testread(2)
 
readln("BINS_SECTION")
testread(1)
 
Nj:=0
U(0):=0
V(0):=0
 
forall(t in 1..Nt)do
   readln(id, Wcat(t), Ccat(t), L(t), U(t))
   testread(5)